[seqfan] Re: Digits of "n" visible in a product

[Eric Angelini]

Hello Hans,
sorry for the typos -- and many thanks
for the corrections ;-/

> (i.e., with more than two odd digit-positions)?

... mmmmh, no, we should be strict
and refuse that. So "0" for #67.

Best,
É.

Le 1 juin 2015 à 02:10, Hans Havermann <gladhobo at teksavvy.com> a écrit :

>> Here are the products for n=1 to 59:
>> 
>> P = 1, 2, 3, 4, 5, 6, 7, 8, 9, 100, 121, 132, 143, 154, 165, 176, 187, 198, 1197, 200, 231, 242, 253, 264, 275, 286, 297, 2184, 2291, 200, 341, 352, 363, 374, 385, 396, 3478, 3382, 3198, 400, 451, 462, 473, 484, 495, 4262, 4277, 4080, 4998, 500, 561, 572, 583, 594, 5555, 5768, 5073, 5684, 5192.
> 
> 15  165 should be 105
> 18  198 should be 108
> 25  275 should be 225
> 30  200 should be 300
> 35  385 should be 315
> 37  3478 should be 3071
> 45  495 should be 405
> 46  4262 should be 4462
> 56  5768 should be 5264
> 
> I think term #67 is the first one for which I have no solution < 10^4. Or did you mean for two-digit indices to be visible in products >=10^4 (i.e., with more than two odd digit-positions)?
> 
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